Electronic keyboard instrument



FIG. 1 is a perspective view of the top, front and left side of an electronic keyboard instrument showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a bottom plan view thereof.

The portions shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an electronic keyboard instrument, as shown and described. 